I recall that there was a trick to block Eufy from phoning home by connecting them to a Wifi network that connects to the internet only through a custom DNS ser

I recall that there was a trick to block Eufy from phoning home by connecting them to a Wifi network that connects to the internet only through a custom DNS server that blocks all the Eufy specific hosts. I am not sure about it but was wondering if anyone has done it successfully so far? I have Eufy cameras too but never trusted them for security, although they are pretty reliable for me from a service perspective.